【摘要】 矿井底板突水和水压致裂具有同源的力学机制,都是确定岩石(体)破坏的临界水压(突水系数为单位厚度的临界水压)。从水压致裂理论分析得出,有效应力系数对其作用显著。针对矿井底板破坏突水问题,通过对突水实例模拟分析,从稳态和瞬态两方面深入探讨有效应力系数变化对煤矿底板破断突水过程的影响。基于有效应力概念,推导煤层底板在不同渗透状态下临界突水系数的公式。最后,根据矿井底板不同的渗透特性,提出修正突水系数的计算方法和现场测试使用方法,对深刻理解岩体破坏突水的渗流力学本质、突水系数的内涵、指导底板注浆防渗设计,具有重要的理论和实用价值。更多还原

【Abstract】 Water outbursts from coalmine floor and hydraulic fracturing have the homologous mechanical mechanisms,which are all to determine the critical water pressure during failure process(water outburst coefficient is defined as critical water pressure per unit thickness of floor).The effect of effective stress coefficient is remarkable through hydraulic fracturing theoretical analysis.The influence of different effective stress coefficients during the process of water outburst in coal mine floor is discussed from static and transient aspects by in-situ case simulation,respectively.The formula of modified critical water outburst coefficient under different seepage conditions in coal mine floor is derived according to the theory of effective stress.Finally,calculation and field test methods of modifying water outburst coefficient are proposed according to different seepage conditions in coal mine floor,which have significant theoretical and practical senses for understanding the essences of water outburst induced by rock failure,the connotation of water outburst coefficient,and the guidance of seepage control design by grouting.更多还原